Scorpions have a prosoma, pedipalps that are modified into claws, and chelicerae. Which taxonomic group are they a member of?
A. Hexapoda
B. Crustacea
C. Chelicerata
D. Myriapoda
Answer: C
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The U.S. Food and Drug Administration warns children, mothers and potential mothers to avoid eating tuna because of high mercury levels. A typical can of albacore tuna contains about 4 times the amount of mercury that a healthy, average-sized adult may safely consume in a day. Do you think cans of tuna should carry labels warning of mercury content?
1.Yes; we can’t risk having children or mothers negatively affected by mercury poisoning. 2.No; the FDA advisory about mercury is enough warning.
A one-way relationship in which one species benefits
at the expense of another is a. commensalism. b. competitive exclusion. c. parasitism. d. obligate mutualism. e. a neutral relationship.
The Lygaeus mode of sex determination is the ________
A) scheme based on single translocations in the X chromosome B) XO/YY scheme C) hermaphroditic scheme D) XY/XX scheme E) XX/XO scheme
After the centromeres separate during mitosis, the chromatids, now called _______, move toward opposite poles of the spindle.
a. centrosomes b. kinetochores c. half-spindles d. asters e. daughter chromosomes